Supported 3,5-Disubstituted Chiral Hydantoin: A Practical Catalyst for the Asymmetric Hydrocyanation of 3-Phenoxybenzaldehyde
摘要:
A novel synthesis of six (R)-3,5-disubstituted chiral hydantoins in mixed solvent is reported. The catalysts were supported on a new polymeric resin afterwards and their enantioselectivities are examined via the asymmetric hydrocyanation of 3-phenoxybenzaldehyde.
Asymmetric Hydrocyanation of Benzaldehydes Catalyzed by (5<i>R</i>)-5-(4-Imidazolylmethyl)-2,4-imidazolidinedione
作者:Hidenori Danda
DOI:10.1246/bcsj.64.3743
日期:1991.12
The catalytic activity of (5R)-5-(4-imidazolylmethyl)-2,4-imidazolidinedione (3) was examined in the asymmetric hydrocyanation of 3-phenoxybenzaldehyde (1a) to (S)-2-hydroxy-2-(3-phenoxyphenyl)acetonitrile ((S)-2a), an important alcohol moiety of optically active pyrethroid insecticides. Among the catalysts, 3-benzyl derivative (3d) exhibited moderate enantioselectivities for 1a and other benzaldehydes.